Spray gun



FIG. 1 is a front view;

FIG. 2 is a rear view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a right view thereof; and,

FIG. 7 is a perspective view of a spray gun showing my present design. 

The ornamental design for a spray gun, as shown and described. 